Optic sensor(overfill detection system for tank truck,socket,probe) Optic sensor(overfill detection ... is about 1,500 units to 2,000units of different types of vehicles every month and our products have been ... from more than 110 countries and regions. Our average value of sales per year is about 150,000,000USD, and ... and Valves etc. Optic sensor(overfill detection system for tank truck,socket,probe)